Lifting-jack.



LGOOK. LIPTING JACK. APPLIUATIO N FILED JAN.20,1909.

Patented Nov. 16. 1909.

a SHBETS*SHEET 1.

ii witnesses V I B. COOK.

LIPTING JACK. APPLICATION FILED JAN. 20, 1909.

Patented Nov. 16. 1909;

- 3 SHEETS-SHEET 2.

J 3111mm foz E. 0001;. LIFTING JAGK.

APPLICATION FILED JAN. 20, 1909.

. Q3 a) -tin 1.. ill w LIFTING-J'ACII.

Specification of Letters latent.

Application filed Yanuary 20, 1909. Serial No. 47632;.

To all whom it may concern:

tie it known that l, EUGENE Coon, a citizen oi: the United States, residing at Kala mazaoo, county of Kalamazoo, and State of lriiehigan, have invented certain new and useful Improvements in Lifting-Jacks, of which the tollowing is a specification.

This invention relates to improvements in lifting jacks.

lily invention relates particularly to the cl: of jacks shown in Letters Patent 51,523, dated June 23, 1908, issued to Clayton lbutlcr and inyseli jointly, and is a modilication, one in some respetts, an improvement upon the structure there illustrated.

The main objects oi: this invention are: llirst, to provide unimproved lifting jack which may be operated in any position. Second, to pro vide an improved lifting jack, the operative parts of which are very simple and economical to produce and are easily and quickly assembled, and at the some time to produce a jack which is very strong and durable.

Further objects, and objects relating to structural details, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specification.

The invention is clearly defined and pointed out in the claims.

A structure embodying the features of my invention is clearly illustrated in the accompanying drawing; forming a part of this specification, in which;

Figure 1. is a side elevation of a structure embodying the features of my invention, a portion only of the operating lever being shown. Fig. 2 is an enlarged detail view, with one oi the side plates removed, the reversing plate being shown in its inoperative position. Fig. 3 is a corresponding view with the locking plate released and in its operative position. Fig. l is a corresponding view with the operating lever shown at the liznit oi its upstroke, the inner pawl being released. Fig. 5 is an enlarged detail section, taken on a line corresponding to the broken line 5*?) of Fig. Fig. 6 is axle tail side elevation. with the reversing memher and the springs removed, the casing being shown in vertical section. Fig. 7 is an enlar ed detail section, takenon a line cor to line E of Fig. E2. Fig. 8 is a detail side elevation of a structure embodying the features of my invention.

in the drawings, similar reterence characters refer to similarparts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Referring to the drawings, the frame 1 is provided with a suitable way for the rack bar 2. The rack bar is provided with a head 3 at its upper end. The frame is preferably provided with a removable side plate i.

When this plate is removed, the frame opened, so that the operating mechanism may lie-placed therein. The plate is detachably secured to the tr me as by means of the screws 5. The operating lever 6 mounted upon a suitable pivot as 7, a1 ranged transversely of the frame. The pawls 8 and 9 are pivotally mounted, the pawl 9 being mounted upon the operating lever, and the pawl 8 being mounted upon the frame, pivots 10 and 11 being provided therefor.

In the modified construction shown in Fig. 8 both pawls are mounted upon the lever 6, the structure being what is generally designated as a double acting jack. The pawis are preferably provided with laterally projecting pins 12 and 13 which are preferably cast integrally with the pawls. 'lhe pawls are held yieldingly in engagement with the rack bar by means of springs, preferably a U-shaped spring, as l t, which is arranged in an inverted position, so that one of itsarms engages a pin of each pawl.

flhe spring 14 is preferably supported on a pin 15 projecting from the frame. This spring holds the pawl in engagement with the rack bar, so that the jack may be oper ated in any position, that is, on its side or in an inclined position. The spring is held in engagement with the pawls by the lug 16 on the "frame. See Fig. 4c.

To reverse the jack, that is, to adjust it so that it lowers the load when the lever is operated, l provide a reversing plate or member 17, which is preferably pivotally mounted on one of the bearings 18 for the lever pivot 7. This reversingmeinber is provided with fingers 19 and 20 which are adapted to engage the pin 12 on the pawl-8, and the pin 13 on the pawl 9, thereby releasing first one and the the other pawl, when the lever is manipulated. re

Hill

versing member is actuated by the spring 21. This spring is preferably U;-sh aped and is mounted upon a pin 22, pro ecting from the frame. This pin, in the structure illustrated, is also adapted to serve as a pivot for the lever 23, by which the reversing member is locked out of its operative position, it being shown secured in its inoperative position in Fig. 2. The lever 23 is provided with an arm 24, adapted to engage a notch 25, in the reversing member.

The lever 23 is arranged through the frame so as to be engaged by the foot of the operator. As the operating lever 6 of the jack is operated, the paw ls alternately'engage and disengage, thereby raising or lowering the jack, raising it when the reversing member is in inoperative position, and lowering it when it:.is in its operative position. When the reversing member 18 1n its operative position, the pin 26 on the pawl 9 en-' gages the reversing member, the finger 19 of the reversing member being provided with a shoulder-like stop 27, with which the pin engages. On the downward movement of the pawl, whiclrtakes place onthe upstroke of the lever, the pawl first holds the reversing member against the tension of its actuating spring, and as the-pin 26 slips from the shoulder 27 the reversing member is released, so that the spring actuates the same to disengage the pawl. As the reversing plate is carried over on the down-stroke of the pawl 9, as described, and near the end of its movement, the pawl 8 is permitted to engage, see Fig. 4. On the up-stroke of the pawl 9, the reversing plate is permitted to yield when the pawl passes from the shoulder 27, the reversing plate then assuming the position shown in Fig. 3, allowing the pawl 9 to engage and disengage the pawl 8,

the pawls being thus ultimately engaged and disengaged by the operation of the lever 6.

To prevent the tripping of both pawls at the same time, a stop 28 fog the pawl 9 is provided andthis is preferably in the form of a projection on the pawl 8, the stop being located substantially opposite the pivot 10 of the pawl, so that pressure thereondoes not affect the operation of the pawl. By this arrangemerlt of the parts, the structure is adapted to operate in any position, and may be quickly adjusted for elevating or reversing. The main advantageof the present construction over that of the Butler and Cook In the modified structure shown in Fig. 8, I

, my improvement is adapted to a double act ing jack, that is one in which both pawlsare mounted on the lever sothat the rack bar is moved on each stroke of the leveri The stop 29 for the pawl 9 is in this modification in the form of a shoulder on the lever head.

The reversing plate is not illustrated in this figure as it is applied and arranged in sub stanti'ally the same way as in the preferred construction ilhistrated- My improved jack is very simple and econoniical in construction, and'the parts may be assembled by an experienced workman.

The parts are'preferably held in position by the removable side plate substantially as is the case in theButlerand Cookpatent re ferred to above. It isobvious, however, that other means might readily be employed.

Having 'thus described my invention, what.

I claim as new and desire tosecure by Letters Patent is Y I 1. In a lifting jack, the combination with the frame, of a rack-bar; a pivoted lever; a pair. of pawls having laterally projecting pins thereon, one of said pawls being pivotally mounted on said lever; aspring arranged to engage said pins on said pawls whereby they are held yieldingly in engage ment with said rack; a pivotally-mounted reversing member; an actuating spring for said reversing member, said reversing member being provided with fingers arranged to engage said pins on said pawls, one of said .5

fingers being provided with a pin engaging shoulder whereby said revers ng member is held against the tenslon of its actuating rin durin a )artial movement of the lever; a stop for the inner pawl arranged on the outerpa'wl substantially opposite its pivot; and means for holding said reversing rneml'ier in its inoperative position.

2. In a lifting jack, the eombinationwith the frame, of a rack bar; a pivoted lever; a

pair of pawls having laterally projecting pins thereon, one of said pawls being pivotally mounted on said lever; a spring arranged to engage said ins on said pawls whereby they are held yleldingly in engagement with said rack; a pivotally-mounted reversing member; an actuating spring for said reversing member, said reversing member being provided with fingers arranged to. engage said pins on said pawls, one of said fingers being provided with a pin-engaging shoulder whereby said reversing member is held against the tension of its actuating spring during a'partial movement of the lever; a stop for the inner pawl; and-means for holding said reversing member in its inoperative position. v

3. In a lifting jack, the combination with the frame, of a rack bar; a pivoted lever; a pair of pawls having laterally projecting pins thereon, one of said pawls being pivotally mounted on said lever; a spring arranged to engage said pins on said pawls whe: eby they are held yieldingly in engage 1 ment' with said rack; a pivotally-mounted reversing member; an actuating spring for said reversing member, said reversing member being provlded with fingers arranged to engage said pins on said pawls, one of said fingers being provided with a pin-engaging shoulder whereby said reversing member 1s held against the tension of its actuating the frame of a rack bar; a pivoted lever; a

pair of pawls, one of said pawls being pivotally mounted on said lever; a spring arranged to engage said pawls whereby they are heldyieldingly in engagement with said rack; a pivotally mounted reversing member; an actuating spring for said reversing member, said reversing member being ar ranged to engage said pawls, one of the pawls being adapted to holdsaid reversing member against thetension of its actuating spring during a partial movement of the lever; a stop for the inner pawl; and means for holding said reversing member in its inoperative position.

In a lifting jack, the combination with the frame of a rack bar; a pivoted lever; a pair of pawls, one of said pawls being pivotally mounted on said lever; a spring arranged to engage said pawls whereby they are held yieldingly in engagement with said rack; a pivotally mounted reversing member; an actuating spring for said reversing member, said reversing member being arranged to engage said pawls, one of the pawls being adapted to hold said reversing member against the tension of its actuating spring during a partial n'lovementof the lever; and means for holding said re ersing member in its inoperative position.

(3. In a lifting Jack, the combination with the frame, of a rack bar; a pair of alternately acting pawls; means for holding said pawls yieldmgl in enga ement with said rack; a pivotalfy mounte reversing memher; an actuating spring for said reversing plate, said reversing member being adapted to alternately act on said pawls, one of the pawls being adapted to hold said reversing member against the tension of its actuating spring during a partial movement of the pawl; a stop for limiting the movement of the pawl acting on said reversing member; and means for holding said reversing member in its inoperative position.

7. In a lifting jack, the combination with the frame, of a rack bar; a pair of alten nately acting pawls; means for holding said pawls yieldingly in engagement with said rack; a pivotally mounted reversing member; an actuating spring for said reversing plate, said reversing member being ada ted to alternately act on said pawls, one of the pawls being adapted to hold said reversing member against the tension of its actuating spring during a partial movement of the pawl; and means for holding said reversing member in its inoperative position.

8.. In a lifting acl the combination with the frame, of a rack bar; a'pivoted lever; a pair of pawls, one of said pawls being pivotally mounted on said lover; a spring arranged to engage said pawls whereby they are held yieldingly in engagement with said rack; a pivotallymounted reversing member arranged to alternately engage said pawls; an actuating spring therefor; and a stop for the inner pawl, arranged on the outer pawl substantially opposite its pivot.

f). In a lifting jack, the combination with the frame, of a rack bar; a pivoted lever; a pair of pawls, one of said pawls being pivotally mounted on said lever; a spring arranged to engage said pawls whereby they are held yieldingly in engagement with said rack; a pivotally mounted reversing member arranged to alternately engage said pawls; an actuating s ring therefor; and a stop for the inner paw f.

10. In a lifting ack, the combination with. the frame, of a rack bar; a pair of alternately acting pawls; means for holding said pawls yieldingly in engagement with said rack; a reversing member arranged to alternately act on said pawls; an actuating spring therefor; and a stop for preventing the engagement of said pawls when acted upon by said reversing member.

In'witness whereof, I have hereunto, set my hand and seal in the presence of two witnesses.

EUGENE COUK. [ps1 VVi-tnes'ses Cnona ELLYN BPADEN, Jnssm Molnvanvn. 

